S7018 ACDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7018 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
1.17 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
16672 lbf
Radial static load rating
16200 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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S7018 ACDGB/P4A Bearing Product Overview & Core Advantages
The S7018 ACDGB/P4A is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and high-speed performance. Engineered to a P4A tolerance class, this bearing is capable of simultaneously supporting combined radial and axial loads. Its 25° contact angle and light preload (Class B) deliver superior running accuracy and high system rigidity, making it an ideal choice for high-precision spindles and other critical machinery where reliability is paramount.
S7018 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7018 | Basic bearing series, indicating a super-precision, 90mm bore design. |
| ACD | Angular Contact Design with a 25° contact angle. |
| GB | Indicates the bearing is sealed and pre-lubricated with grease. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
S7018 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The phenolic cage material and optimized internal geometry provide excellent dimensional stability and high rigidity, enabling the bearing to handle significant combined loads.
- Superior High-Speed Performance: The lightweight phenolic cage and precision-ground chrome steel components contribute to low friction and heat generation, supporting a high limiting speed of 15,000 rpm.
- Sealed & Pre-Lubricated for Longevity: The integral seals retain grease and exclude contaminants, offering a maintenance-free solution within the specified temperature range of -30°C to 110°C.
- Universal Matching (SU): These bearings are universally matchable, allowing for simplified mounting in sets of two or more to achieve optimal preload and stiffness.
S7018 ACDGB/P4A Bearing Typical Application Areas
The S7018 ACDGB/P4A is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace & Defense Systems
- Medical & Dental Equipment
